Hi! Only Java because it's the language used in the courses. Also we use Java at work.
Kotlin is in my TODO list, I can't give my opinion yet. All my colleagues and friends praise it. When I saw a Kotlin demo at Google I/O I was impressed, so I'll definitely try it! :)

 

Nice! If I can offer some general advice, it would be to not to feel pressure to move to the new hotness. Learn Kotlin if it interests you but Java ain't going anywhere 😋

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